#15. Find the sides of each of the two polygons if the total number of sides of the polygons is 13, and the sum of the number of diagonals of the polygons is 25.
Assume: 8 and 5 D1= n2(n-3)…show more content…

SideA-SideB 28 =28cm – 17cm
17 x 90° = 11cm 19.52-112 Answer: 16.10 =380-121 =259 =16.10
Exercise 1.3 #7. A certain city block is in the form of a parallelogram. Two of its sides measure 32 ft. and 41 ft. If the area of the land in the block is 656ft.2, what is the length of its longer diagonal? A= 656ft.2
A= 656ft.2
Given:
32 ft. 41 ft. Required: d2=? Solution: For θ For d2 A = absin θ d2=a2+ b2 -2ab cos θ θ = sin-1656ft.2(32)(41) d2= (32)2+(41)2+2(32)(41)2 cos 150° θ = 30° d2=70.55105002 ft. θ = 150° Answer: d2=70.55 ft. #9. An isosceles trapezoid has an area 40m2 and an altitude of 2m. Its two bases have a ratio of 2 is to 3. What are the lengths of the bases and one diagonal of the trapezoid? d 2m d 2m
Given:
A= 40m2

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Baranik
Tim Riley
Abstract:
The enthalpy of combustion of naphthalene was experimentally determined to be -5030.44 ± 78.98 kJ/mol which was a 2.5% error from the literature value of -5160 ± 20 kJ/mol.2 The theoretical enthalpy of combustion of solid naphthalene was calculated to be -6862.68 kJ/mol using bond energies for the gaseous molecules, the heat of vaporization of liquid water and the literature value of the heat of sublimation of naphthalene, which was 72 ± 4 kJ/mol.2 The absolute value….

pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing and of a level sufficiently strong to be heard. It is produced when something vibrates causing its the medium (water, air, etc.) around it to vibrate as well. In common everyday speech, speed of sound refers to the speed of sound waves in air. Sound travels faster in liquids and non-porous solids than it does in air. In this experiment, velocity of sound in solid, liquid and gas were determined….

dissolved by the wash solvent.
The first of two tests to determine purity is the melting point determination. A melting point is a characteristic property of a compound, it is the temperature when a solid and liquid phases of a compound coexist, the temperature at which it changes state from solid to liquid at atmospheric pressure. (Pine 1987) To get the melting point range, we get the difference of the temp when the sample melted and the temp where the compound started melting. If the melting point….

functional group and the by-product of this reaction is acetic acid. The crude acetaminophen will form as a white solid after the acetylated reaction. To turn this crude acetaminophen into a purified form, the recrystallization technique will be used.
The recrystallization technique is when the solid is dissolved and forced to precipitate as a crystal solid later on. The crude solid is dissolved through heating with a small amount of solvent, in this case, deionized water. The solution is then cooled….

dichloromethane (CH2Cl2). The separatory funnels were rolled carefully and not shaken. After the extractions, the organic (bottom) layer was collected. The combined organic layer then was dried with anhydrous magnesium sulfate (MgSO4). The insoluble solids were filtered and removed. The filtrate then was transferred into a 250 mL round-bottom flask. Then a rotary evaporator was used to evaporate the solution. This then formed the crude caffeine.
The crude product was recrystallized with acetone-petroleum….

understanding of ambiguous phrases; does not identify key ambiguity in the memo, includes laundry list of phrases without explanation. |
4 or 4 and 5What are the value assumptions and conflicts?What are the descriptive assumptions? | Demonstrates solid understanding of value conflicts and assumptions and descriptive assumptions, clearly identifies and succinctly discusses the major descriptive and value assumptions and value conflicts in the memo. Demonstrates clear understanding of the difference….

is necessary to dissolve all solid material, and heat the reaction at a high enough temperature and for a long enough time period to ensure completion. Cooling the mixture in an ice bath ensures that all crystals have formed, and drying removes any remaining solvent.
The synthesis of acetaminophen does not result in a pure product, so recrystallization is necessary to purify the substance. During recrystallization, it is important to dissolve all of the solid in order to remove all the impurities….